/Engine/Source/Runtime/SlateCore/Public/Layout/Children.h
typedef [TAlignmentSingleWidgetSlotMixin](API\Runtime\SlateCore\Layout\TAlignmentSingleWidgetSlotMixin)< [TSingleWidgetChildrenWithBasicLayoutSlot](API\Runtime\SlateCore\Layout\TSingleWidgetChildrenWithBasicLa-)< InPaddingInvalidationReason >> AlignmentMixinType